The slow-control system

The slow control system consists of two Macintosh computers, two VME crates, an ADC, a DAC and an electronic circuit. It handles both the data acquisition and the control of the target system. The layout is shown in Figure A.7.

Figure A.7: Schematic view of the whole system.

Each Macintosh computer is hosted by one VME crate. The two computers are interconnected via an optic ethernet line (Fig. A.8, A.9 ). The first one (also called MacA) is in the hall. This is the Master. It controls the electronics directly with the slow-control program H2OCEBAF97 written in Labview. The second one (called MacB) is a slave, and is located in the counting house where it controls the target system through MacA.

Figure A.8: Layout of the slow control system.

Figure A.9: Signals layout

Some of the controls and monitoring can also be done manually. This provides an independent way of controlling the target in case the computer control fails. The pump control and the display of the flowmeter and pump speed are duplicated in the counting house. The reading of the optical encoder can also be seen in the counting house through a camera. A manual command of step motors is in the Hall.